Dry Cleaner, Retail Nashua, NH – Fire caused by spontaneous combustion held in check by sprinkler system May 31, 2015 viking210 An early morning fire inside an Industrial Park Drive building was caused by spontaneous combustion of oily rags, according to fire officials. The single-alarm blaze, reported just after 1 a.m. Thursday, happened inside UniFirst Corp., 8 Industrial Park Drive, which is a uniform, maintenance and cleaning supply company. Firefighters responding to a master fire box alarm, arrived to hear alarms sounding and to find a smoke-filled building and sprinklers operating. The fire was located in three bins filled with tightly packed oily rags. The blaze was held in check by the sprinklers, although firefighters stretched one hose to completely extinguish the fire. Pressure fans were brought in to air out the building.